JP2002517620A - Pulper - Google Patents

Abstract

A pulper device includes a vessel in which an annular flow can be generated. The flow acts upon a liquid-sold mixture located inside the vessel and effects a pulping of the same. The device also comprises a screening device for separating coarse materials from the suspension, whereby the screening device has the shape of a truncated cone. The truncated cone is provided with holes on the lateral surface thereof and can be mounted on the base of the vessel in such a way that the truncated cone points upward with the small circular surface thereof, and the lateral surface lies in an approximately tangential manner to the toroidal flow. The screening device is subdivided into different segments and these segments can be individually mounted from the external side of the vessel.

Description

DETAILED DESCRIPTION OF THE INVENTION

The present invention relates to a screening mechanism for separating contaminants from a suspension according to the preamble of claim 1 of the present application, and more particularly to a pulper device using a screening mechanism having a truncated cone.

[0002] Such a pulper device is disclosed in German Offenlegungsschrift 2348540, German Offenlegungsschrift 2658845, German Offenlegungsschrift 2061519, US Pat. No. 26616.
No. 66.

[0003] Screening mechanisms are used for many different applications in various industrial fields. Screening mechanisms are widely used in processing techniques to separate fluids, including solids of various sizes. Important applications include those related to so-called pulpers used for the treatment of mixtures containing components that are easily suspended. Important areas of application include, besides the paper industry for the processing of waste paper, also those related to the processing of waste and substances such as waste.

[0004] Such a pulper consists of a container provided with a rotor. In operation, the mixture to be treated is charged to a container and the container is further filled with a liquid, usually water. A strong flow force is generated by the rotation of the rotor. Viewed from the axial section of the pulper, this flow has a toroidal (truncated curved surface of revolution) shape, with two flow components, a radial flow and a concentric flow, overlapping each other. This flow first flows radially outwards to the vessel wall in the rotor area, then rises upwards, flows radially inward again in the liquid level area, and is immediately led to the center of the rotor . This flow can be supported by providing additional guide plates. At the same time, the liquid receives a dynamic impact in the direction of rotation of the rotor. This toroidal stream causes the solids contained in the liquid to repeatedly reach the rotor region and be processed there.

[0005] This strong flow suspends the easily suspendable solids in the pulper. In addition to suspension, the fibers may also be partially cut, or some of the suspendable substance may be dissolved. However, since the emphasis of this treatment is on suspension, only the "suspension" will be discussed below, but the disintegration and dissolution occurring in parallel with suspension will not be treated separately. Absent.

[0006] The suspended components of the charged mixture form a suspension with the liquid and can be withdrawn from the pulper by means of a perforated screen. Non-suspended components remaining in the pulper (hereinafter also referred to as "impurities") can be removed from the pulper by a different method, for example, by introducing a coarse contaminant collector into the pulper.

[0007] Preferred applications include, for example, those relating to the treatment of waste paper or the treatment of wastes for the biological use of individual components. In treating waste, components that are biologically available are separated from components that are not biologically available. Bioavailable components can be easily suspended, while other components are difficult or non-suspendable.

[0008] The product suspension, which is separated by the perforated screen, is enriched in the bioavailable components, and this suspension is then subjected to a biological treatment. on the other hand,
Components that are not bioavailable, i.e., contaminants remaining in the pulper after withdrawing the suspension, may be separated into another suitable use form or disposed of.

Other screening mechanisms conventionally used in conjunction with pulpers to separate contaminants from suspensions include those formed as flat screens (
For example, European Patent Publication 0520172 and German Published Patent Application 195 06 084
No. 5) and those formed as cylindrical screens (eg European Patent Publication 05).
98187).

[0010] When a flat screen is used, the solids in the non-suspendable or difficult-to-suspend pulper, such as pebbles and glass shards, cause severe abrasion of the screen as a result of the toroidal flow changing over the screen. Will be. In addition, there is a risk of clogging the holes in the screen. Heavy components in the mixture tend to settle on the screen and remain on the screen if these components are not suspended and cannot pass through the screen with the suspension. A common way to keep such contaminants from remaining on the screen and to ensure the passage of the suspension is to repeatedly clean the screen surface with clearance rails. However, this clearance rail is also severely worn.

Another problem arises when using a cylindrical vertical screen. In this screen,
The suspension is withdrawn through a vertically arranged screen member. In this case, the non-suspended contaminants tend to accumulate around the screen at the bottom of the pulper, so that the passage of the screen tends to be clogged. The condition of the flow in the pulper is not such that contaminants move sufficiently to clean the screen surface. This is because the flow does not touch the vertical members of the screen. Again, it can only be cleaned by using an additional method, generally a clearance rail. Contaminants that accumulate around the screen at the bottom of the pulper also contribute to severe wear. Another substantial problem arises with the use of clearance rails. The clearance rail breaks down the plastic components in the waste. The crushed small plastic particles can pass through the perforated screen with the suspension. In this way, the plastic particles contaminate the suspension intended for bioavailability, resulting in undesired levels of contamination in the final product, in particular in the compost and the treated water.

[0012] It is an object of the present invention to improve a pulper as described above for separating contaminants from a suspension, reduce abrasion, facilitate screen cleaning and maintenance,
To facilitate the passage of the suspension and improve the quality of the product.

According to the present invention, the above object is achieved by a pulper according to claim 1 of the present application. The dependent claims describe additional preferred embodiments of the invention.

The gist of the present invention is to use a screen device having a frusto-conical shape.
The truncated cone has its smaller circular surface facing upwards. A plurality of holes in the screen device are provided on the inclined sides of the frustoconical. The slope is contoured such that it is placed substantially adjacent to or substantially parallel to the toroidal flow. Also,
The screen device is split and can be mounted externally.

The angle of inclination is preferably between 30 ° and 50 °, but this value can be varied depending on the shape of the container. The slanted arrangement allows the flow to constantly sink the impurities down the pulper and remove them from the side of the screen, i.e. the impurities can accompany the flow. This effect is further supported by using a scraper. However, the scraper in this case requires less load compared to the scrapers used in the prior art. This is because, in contrast to the flat and cylindrical screens described above, the purification is not carried out exclusively by clearance rails, but rather by flow.

Since the contaminants are constantly removed from the screen by the flow, in contrast to the screening mechanisms used in the prior art, the contaminants can be deposited less on or around the screen. Wear caused by sand, pebbles, glass fragments and the like is also substantially reduced. In addition, the passage through the screen is made more convenient because the screen surface is more preferably cleaned, which reduces the time for withdrawing the suspension.

The holes in the screen can be of various shapes, for example square, circular or oval. Their typical dimensions are preferably between 6 and 30 mm. Desirably, the screen is divided into a plurality of segments to facilitate disassembly.

The scraper used to support the purification of the coarse impurities from the screen holes is preferably attached to the rotor or its shaft, and can be formed into various shapes. The scraper may be linear or inclined, for example. Desirably, the scraper bends continuously or discontinuously in the opposite direction to the flow and has a wear-resistant body. The antiwear body can preferably be replaceable and / or adjustable.

Preferably, a pump is employed to withdraw the suspension from the pulper through the screen, the drive of the pump being controllable. However, it can also be discharged by a natural fall into a storage container installed below.

The present invention is particularly suitable for use in the treatment and separation of mixed wastes having a high organic content, for example municipal biological wastes. These wastes, in addition to biological organic components suitable for biological treatment and subsequent recycling to natural circulation,
It is characterized by containing components related to non-biodegradable substances such as plastics, pebbles, glass, and metals.

The present invention will be described below in detail by preferred embodiments with reference to the accompanying drawings. Figure 1
1a to 1c are explanatory diagrams of an embodiment of the screening mechanism according to the present invention.

The mixed waste is supplied to the cylindrical pulper container 1 and water is added. I indicates the supply of waste and II indicates the supply of water.

By rotating the rotor 2 about the axis R of the container, the waste-water mixture starts to move. A strong toroidal stream 3 is generated and the non-woody waste components of the biological organic matter are suspended. The fibers form a suspension with the liquid in the pulper, are withdrawn through a frusto-conical perforated screen 4 located below the pulper and flow out as discharge stream III. If necessary, a pump (not shown) may be connected to the discharge stream. Non-biodegradable organic matter and woody waste components are stored in the pulper container 1.
And remains as a foreign material without being greatly destroyed by the force of the flow.

The product suspension, which is separated by the perforated screen, is enriched in the bioavailable components, and this suspension is then subjected to a biological treatment. On the other hand, components that are not bioavailable, ie contaminants remaining in the pulper after withdrawing the suspension, are treated in another suitable treatment form or another disposal form.

The embodiment of the screening mechanism 4 of the invention described herein has a frusto-conical shape. The holes in the screen are provided in the frusto-conical side surface 5 and are circular and typically 10 mm in diameter. The angle of the outer surface of the screen is about 30 ° to 50 ° with respect to the rotation axis R.

As can be seen in particular in FIG. 1 b, the scraper 6 is mounted on the rotor 2 or the rotor shaft and is arched in the opposite direction to the flow. The front face of the scraper 6 is protected by a replaceable and adjustable wear protection 6a. A collection container (not shown) is provided below the discharge stream III, in which the effluent suspension is collected.

As can be seen from FIG. 1c, a plurality of screen segments of the screen 4 are attached to the screen backing plate 9 by screws 8 from the outside of the container so that the screws 8 can be removed to remove the segments from the inside of the container. I have.

Although the present invention has been described based on the preferred embodiment, the present invention is not limited to this embodiment, and can be modified in various ways.

[Brief description of the drawings]

FIG. 1a is a sectional view illustrating an embodiment of a screening mechanism according to the present invention.

FIG. 1b is a cross-sectional view taken along line AA ′ of FIG. 1a.

FIG. 1c is an enlarged sectional view of a Z region of FIG. 1a.

[Procedural Amendment] Submission of translation of Article 34 Amendment of the Patent Cooperation Treaty

[Submission date] May 2, 2000 (2005.2)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claim 1

[Correction method] Change

[Correction contents]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0001

[Correction method] Change

[Correction contents]

[0001] The invention is based on claim 1 of the present application , as is known from DE 964286.
It is to Seki screening mechanism according to the preamble.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0002

[Correction method] Change

[Correction contents]

[0002] Such a pulper device is disclosed in German Offenlegungsschrift 2348540, German Offenlegungsschrift 2658845, German Offenlegungsschrift 2061519, US Pat. No. 26616.
No. 66. Another pulper device is described in French published patent application 137,476.
No. 7.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0003

[Correction method] Change

[Correction contents]

[0003] Screening mechanisms are used for many different applications in various industrial fields. Screening mechanisms are widely used in processing techniques to classify free flowing materials, including solids of various sizes. Important applications include those related to so-called pulpers used for the treatment of mixtures containing components that are easily suspended. Important applications include , besides the paper industry for the processing of waste paper, also those related to the processing of waste and substances such as waste.

──────────────────────────────────────────────────続 き Continuation of front page (81) Designated country EP (AT, BE, CH, CY, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE ), EA (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM), BR, CA, CN, CZ, HU, ID, IN, JP, KR, MX, NO, PL, RO, SI , US F-term (reference) 4L055 AA11 CA10 EA16 EA19 FA22 GA35

Claims (10)

[Claims] 1. A container capable of generating a toroidal flow acting on a liquid-solid mixture contained therein for suspending the mixture, and for separating contaminants from the suspension. A pulper comprising a screening mechanism (4),
The screening mechanism (4) has a frusto-conical shape, with a plurality of holes on its side, the smaller circular surface of the frusto-cone facing upwards and the side being arranged substantially in contact with the toroidal flow. Installed at the bottom of the container (1), and the screening mechanism (4) is divided into different segments, these segments being adapted to be individually attached from the outside of the container. A pulper characterized by the following. 2. The pulper according to claim 1, wherein the angle of the side surface is between 30 ° and 50 °. 3. The pulper according to claim 1, wherein the holes of the screen are square, circular or oval. 4. The pulper according to claim 1, wherein a typical size of the screen hole is 6 to 30 mm. 5. The pulper according to claim 1, wherein the holes of the screen are circular, and preferably have a diameter of 8 to 12 mm. 6. A rotor mechanism (2) arranged in said container (1), said frusto-conical cone being mounted substantially parallel to the axis of said rotor. The pulper according to any one of the above. 7. A scrubbing mechanism connected to the rotor mechanism and rotatable.
The pulper according to any one of claims 1 to 6, wherein 6) is provided so that the surface of the screen provided with the holes can be purified by the scrubbing mechanism (6). 8. The scraper of claim 7, wherein the scraping mechanism comprises one or more scrapers having a continuous or discontinuous bend in a direction opposite to the flow. Pulper. 9. The pulper according to claim 8, wherein the scraper has a replaceable and / or adjustable anti-wear on its front face. 10. The pulper according to claim 1, wherein the suspension can be withdrawn from the screening mechanism by a pump having a controllable drive.